Use DefaultAnalyzerFacade for common code in diagnostic tests

Because of incomplete infrastructure, introduce a few dirty hacks to make
diagnostic tests analyze the common code via DefaultAnalyzerFacade, and also
add common module sources to analysis of platform-specific modules.

Also do not render 'platform' declarations from platform-specific modules to
the .txt file, since they are very likely to be exact copies of the same
declaration in the common module (see RecursiveDescriptorComparator)

compiler/tests-common/org/jetbrains/kotlin/test/util/RecursiveDescriptorComparator.java

@@ -32,6 +32,7 @@ import org.jetbrains.kotlin.name.FqName;
 import org.jetbrains.kotlin.renderer.*;
 import org.jetbrains.kotlin.resolve.DescriptorUtils;
 import org.jetbrains.kotlin.resolve.MemberComparator;
+import org.jetbrains.kotlin.resolve.MultiTargetPlatform;
 import org.jetbrains.kotlin.resolve.scopes.ChainedMemberScope;
 import org.jetbrains.kotlin.resolve.scopes.MemberScope;
 import org.jetbrains.kotlin.test.KotlinTestUtils;
@@ -204,6 +205,10 @@ public class RecursiveDescriptorComparator {
             }
         }
 
+        // 'platform' declarations do not belong to the platform-specific module, even though they participate in the analysis
+        if (descriptor instanceof MemberDescriptor && ((MemberDescriptor) descriptor).isPlatform() &&
+            module.getCapability(MultiTargetPlatform.CAPABILITY) != MultiTargetPlatform.Common.INSTANCE) return false;
+
         return module.equals(DescriptorUtils.getContainingModule(descriptor));
     }